Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
Clickable Guide
Moths Butterflies Flies Caterpillars Flies Dragonflies Flies Mantids Cockroaches Bees and Wasps Walkingsticks Earwigs Ants Termites Hoppers and Kin Hoppers and Kin Beetles True Bugs Fleas Grasshoppers and Kin Ticks Spiders Scorpions Centipedes Millipedes

Calendar
Upcoming Events

BugGuide is a National Moth Week Partner. How to add your National Moth Week 2021 photos. July 17-25.

Photos of insects and people from the Spring 2021 gathering in Louisiana, April 28-May 2

National Moth Week 2020 photos of insects and people.

Photos of insects and people from the 2019 BugGuide Gathering in Louisiana, July 25-27

Discussion, insects and people from the 2018 gathering in Virginia, July 27-29

Photos of insects and people from the 2015 gathering in Wisconsin, July 10-12

Photos of insects and people from the 2014 gathering in Virginia, June 4-7.

Photos of insects and people from the 2013 gathering in Arizona, July 25-28

Previous events


TaxonomyBrowse
Info
ImagesLinksBooksData

Genus Craesus

Caterpillar medusa - Craesus latitarsus How many sawfly larvae can fit on a leaf? - Craesus latitarsus Green Worms devouring Birch tree - Craesus latitarsus Craesus latitarsus (probably) - Craesus latitarsus Craesus sawfly larvae on gray birch - Craesus latitarsus Craesus latitarsus? - Craesus latitarsus Sawfly larvae on river birch - Craesus latitarsus
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Hymenoptera (Ants, Bees, Wasps and Sawflies)
No Taxon ("Symphyta" - Sawflies, Horntails, and Wood Wasps)
Family Tenthredinidae (Common Sawflies)
Subfamily Nematinae
Tribe Nematini
Genus Craesus
Synonyms and other taxonomic changes
=Croesus Leach 1817 (misspelling)
Numbers
4 spp. in our area(1)
Remarks
Comment from Dave Smith: "The large, flattened hind basitarsus is a character for the genus. Three species, all similar in color, occur in eastern U.S. They are separated by the texture of the mesopleuron and characters in the ovipositor - things I can't see in pictures. The most common is C. latitarsus Norton, the dusky birch sawfly. Other species feed on Castanea (chestnut) and Corylus (hazelnut). . . Most all emerge in the summer, July through August."